When a student studies hard during exam and sacrifices sleep then he/she may end up with a canker sore

A canker sore has a white center and it has borders that you can easily see. Canker sores usually travels alone and you can get one just inside of the cheek or lips but very seldom they are found on tongues. Usually, the canker sore becomes painful for 3 days or at most 4. If you are often stressed or fatigued then you might have canker sores more often. It's most often that students get their canker sores when they have exams as they don't get enough sleep. There are a lot of canker sore

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